(1)
Sari, K.; Supriadi; Siregar, A. Z. .; Sibarani, M. J. . Survey and Mapping of P Nutrient Status on Paddy Land in Aek Simare Irrigation Area, Laguboti District, Toba Samosir Regency, Northern of Sumatera, Indonesia. Petrop 2020, 7, 25-31.